摘自C语言论坛。 写好程序,用gcc编译,带上-pg参数,然后运行以后分析gmon.out文件:
starwing@starwing-desktop:~/Work/prj$ cat test.c
#include 
#include 

int func(int i)
{
    return i <= 2 ? 1 : func(i - 1) + func(i - 2);
}

int main(void)
{

    printf("zzz: %d\n", func(20));
    return 0;
}
/* cc: cmd='' */
starwing@starwing-desktop:~/Work/prj$ gcc -o test -pg test.c
starwing@starwing-desktop:~/Work/prj$ ./test
zzz: 6765
starwing@starwing-desktop:~/Work/prj$ gprof ./test ./gmon.out
另一个C语言:
/**
*      file_name:      time_lost.c
*    description:
*
*        version:      1.0
*        created:      3:32 2009-7-21
*       revision:      none
*       compiler:      gcc 4.3.3
*
*         author:      prankmoon@gmail.com
*        company:
*/

#include 
#include 

/* just for test */
int foo(int n)
{
    int i;
    int sum = 0;
    for (i=0; i
            

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1 Responses so far.

  1. Jak Wings 说:

    呃,下面那个竟然是纳秒级的……服了 Orz

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